Ceiling shield dimensions - Canada

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New Member
Sep 5, 2020
Hi there!

I recently moved in a home with a non certified stove from the 90s, still in good shape.

It's located in a unfinished basement, concrete floor, stone foundation, so no concerns about combustibles here.
The ceiling is very low, and, from what I understand, I can reduce the clearance above the stove to 30im by hanging a cement board above the stove.

What I can't figure out is the actual dimensions for this board, ie. how much it should extend past the sides of the stove.

Thanks for the help!